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D( a )
a+24 = 0
a+24 = 0
a+24 = 0
a+24 = 0 // - 24
a = -24
a in (-oo:-24) U (-24:+oo)
1/9 = a/(a+24) // - a/(a+24)
1/9-(a/(a+24)) = 0
(-1*a)/(a+24)+1/9 = 0
(-1*9*a)/(9*(a+24))+(1*(a+24))/(9*(a+24)) = 0
1*(a+24)-1*9*a = 0
24-8*a = 0
(24-8*a)/(9*(a+24)) = 0
(24-8*a)/(9*(a+24)) = 0 // * 9*(a+24)
24-8*a = 0
24-8*a = 0 // - 24
-8*a = -24 // : -8
a = -24/(-8)
a = 3
a = 3
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